WHIRLYBIRD RUN METHOD OF PLAY Be on guard for rockets that are constantly being launched as you fly your chopper over varing terrain using the right joystick to control speed and elevation. You fire missiles and drop bombs by pressing the button on the right joystick. Try to destroy as many rockets, alien ships and alien bases as you can but avoid crashing into mountains, the top of the board, or alien craft. You start each game with four choppers and a full fuel tank for each chopper. Hit- ting an enemy fuel tank will add one fuel unit to your fuel tank. Your current score, number of remaining choppers, and fuel level are shown at screen top. SCENARIOS The game progresses through five different game boards, each providing a different challenge. The Cavern of Doom provides the final obstacle to your chopper flight. The varying heights of the mountains and the ceiling make this the most difficult board to master and successful completion of the Cavern of Doom will restart the board sequence at an increased difficulty level. FUEL The colored bar at the upper left side of the screen is your fuel indicator. When you run out of fuel, your chopper will slowly lose altitude until you crash. You can get extra fuel by shooting or bombing the alien ground crasft which have an "F" on them (FUEL TANKS). SCORING Enemy Craft........................100-400 points Rockets............................50-100 points Fuel Tanks.........................200 points Arrow..............................0 point Mushrooms Cloud....................5000 points Bouncing Saucers...................200 points